Lobster Cooking Times by Weight

The time to cook your lobster will always depend on the weight of it. It doesn’t matter if it is a one-pound chick or a ten-pound jumbo, whether you’re boiling or steaming, it always needs to be timed from the second the water climbs back to a boil or when it hits the grill. How long to cook a lobster for is one of the most common questions our customers ask when their order arrives, so we created this guide.

The chart below is the one we cook by, and it is built on the lobster’s own weight and a 135 to 140°F finish. Use it as your starting point, then let the thermometer make the final call. It is the only number that never lies.

While the cooking times change by the size of the lobster, there’s a few things that remain consistent:

• Pull temperature: The lobster is fully cooked and safe to eat once it reached 135–140°F in the tail. FDA guidance is 145°F.
• Salt: For boiling and parboiling, add ¼ cup salt per gallon to the water.
• Water levels: 1 gal per lobster for boiling; 2 inches for steaming.
• Crowding: If the water stops boiling for more than 30 seconds, run batches of lobsters vs. all in one to keep the time on track.

Food-safety reference: FDA seafood temperature and doneness guidance.

Boiling and Steaming

Weight	Boil	Steam
1 lb	6 – 7 min	7 – 8 min
1¼ lb	7 – 8 min	8 – 9 min
1½ lb	8 – 9 min	9 – 11 min
2 lb	10 – 12 min	11 – 12 min
2½ lb	11 – 13 min	12 – 13 min
3 lb	12 – 14 min	12 – 14 min
4 lb	15 – 17 min	17 – 20 min
5 lb	18 – 20 min	22 – 24 min
6 lb	20 – 23 min	24 – 27 min
7–8 lb	23 – 28 min	27 – 32 min
9–10 lb	30 – 34 min	34 – 38 min

When it comes to grilling lobsters, smaller and medium size lobsters (3lbs and under) should be split in half after being dispatched and cooked meat side down for roughly 4 – 6 minutes, then flipped over for another 5 – 8 minutes. For 4lb and higher, parboil the lobster first, then split the lobster and grill 4 – 6 minutes flesh side down, then flipped over for another 5 – 8 minutes just like the smaller lobsters. You want to watch for the meat to turn opaque, have a firm texture, and reach the desired temperature range of 135–140°F in the thickest part of the tail. This will change depending on how hot your grill is.

Now that you know how long for steaming and boiling, look below the image to find more tips, and fun facts like the reasons why you’ll see different cooking times on different websites. You’ll even learn how to adjust based on the altitude you’re cooking at and based on the shell of the species of lobster.

For the full method, boiling through grilling, that all lives in our complete lobster cooking guide.

Why Cooking Times Vary So Much Online

Searching for lobster cooking times can be frustrating as a cooking blog could say 7 to 10 minutes per pound while a restaurant has an article from their chef recommending a flat 6 to 9 minutes, and popular cooking personalities that may recommend 4 to 5 minutes. This is why lobsters get overcooked, consistency and temperature measurement need to be watched just as closely as the time per weight.

The problem is the “minutes per pound” rule itself. Lobster does not cook in a straight line. As it gets heavier, its mass grows faster than its surface area, so a 3lb lobster does not need three times as much time as a 1lb lobster. This is like doubling the heat when baking to reduce the cooking time in half, it does not work. If you multiply a per-pound rule, you end up with 21 minutes for a 3 pound lobster when the actual cooking time is 12 – 14 minutes. That one mistake is behind most tough, rubbery lobsters.

The next issue is where you’re cooking and the type of lobster you’re cooking. Water boils at 208 instead of 212 above 2,000 feet, and continues to decrease temperatures from there, which means most of the western USA and some of the Northeast will have different cooking times for their lobsters than people living close to sea level like Florida and Washington D.C. When you get to extremely high elevations like Denver, the boiling point is as low as 202 degrees, so the time needs adjusted even further. Soft shells vs. hard shell lobsters also require changes to cooking times. Because lobsters cook fast, minutes matter compared to other types of seafood.

The Reason a Minute Matters So Much

Fish are a more forgiving meat than Lobster when it comes to cooking, and they can be flavored like lobster. Cod is sometimes called “poor man’s lobster” and there have even been legal cases brought up by some restaurants pretending to serve lobster when in reality it was fish or crawfish like this one.

The reason minutes do not matter as much when cooking fish is that fish like cod have short muscle fibers that flake apart the moment they cook. Lobster is the opposite as it has long, dense fibers packed in tight that go from set to seized in a narrow window. If you can hold them in the sweet spot, the meat stays sweet and firm. Once it overcooks, the proteins clench and wring out their own moisture. This is when the meat becomes rubbery. This is the whole reason two extra minutes can wreck a lobster when the same two extra minutes barely touches a fillet of cod.

Lobster Cooking Time Adjustments by Shell Type, Altitude & More

Hard Shell vs Soft Shell

A hard shell will need a minute or two past the chart above as the hard shell is thicker and more calcified than a soft shell working like a thermal barrier. A soft shell overcooks in a blink, so cut a minute off the cooking times and keep a close eye on it. The time of year the lobsters are caught can determine if it is a soft or hard shell.

A lot of the Maine catch from July into late September comes in soft, but every lobster is graded before it ships, which is how we send hard and firm shell in the dead of January. If your box came from us, run the full time. If you grabbed one off a dock in August, squeeze the side of the body first, a soft shell gives and a hard shell does not. Hard shell vs soft shell

Altitude 

The higher you are, the cooler water boils at roughly 1°F for every 500 feet, so the same pot cooks slower. Add about two minutes to the cooking time for boiling and keep the lid down tight. Your thermometer is going to be your most important tool here, so watch for it to hit the sweet spot between 135–140°F. High-altitude lobster cooking

Frozen and Thawed

Thaw your frozen lobsters all the way in the fridge before any cooking method. This takes roughly 12 to 24 hours, then cook it on the fresh-lobster times. If it is still icy in the middle, give it an extra minute to thaw out. Do not drop it in or cook a whole lobster frozen as the outside will turn to rubber while waiting for the middle to catch up. Storing and thawing

Pull it at 135 to 140°F

Use a thermometer in the thickest part of the tail, going in from the side nearest the body. When the timer and your eyes disagree, this is the tiebreaker. FDA guidance for seafood is 145°F, and a lobster you pull at 135°F drifts up to 140 to 145°F just sitting on the counter. One thing to keep in mind is that the color will not tell you when the lobster is done cooking has reached a safe temperature. The color red only proves that heat happened, not that the inside is cooked. Doneness, temperature, and visual cues

Other Methods, Tips, and Tails

The times above are for whole lobster, boiled or steamed. Grilling, baking, broiling, and the rest run on their own clocks, and lobster tails run differently again. Pick a method from the complete cooking guide, or jump straight to cooking lobster tails.

Past 5 Pounds

The old line is that big lobsters cook up tough. They do not. What is true is that they are easy to overshoot, because the times printed for them run long and a jumbo has enough thermal mass to hide the truth from you until you cut it open. Bring the pot up, put the lobster in, then back the heat off so it poaches instead of rolling hard. Low and slow buys you margin on a big one, the same as it does on a roast. Large lobster times and technique

If It Came Out Wrong

Rubbery all the way through means it cooked too long, and honestly that is the only thing that does it. Some pieces done and others still glassy means the pot was crowded or you ran mixed sizes in one batch. Meat that comes out mushy or cottony was never a timing problem at all, the lobster went in weak or already died. No clock or cooking method can fix improperly sourced or dead lobsters.

Lobster Cooking Time FAQ